help! I don't know what to do!?

Corie • I`m 29, DH is 27. On the journey to ttc our 1st baby!
Okay ladies I need some help. My mom bought this like years ago at a charity auction and had always hoped I'd use this (only child). I just don't know how safe this is or how I feel and I reallllyyyy don't want to hurt my moms feelings. I know she paid a lot for this and was so excited. Thanks for thoughts and opinions!! 
Update: my mom has found a baby mattress that does fit this and has ordered it. So no worries about that. And yes it has a pin you can remove to have it rock back and forth.